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9-Year iOS Dev Builds Game with AI, Wins $25K Prize

A seasoned iOS developer with nine years of experience has proven that you don't need to write a single line of code to build a winning game. In just 15 days, he created a Capybara food delivery game entirely using AI tools and walked away with $25,000 (about 170,000 RMB) from the Cursor Vibe Jam2026 competition. This victory is being hailed as a landmark moment for AI-generated code projects in the global "Vibe Coding" game development contest.

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188 Submissions, 27,000 Lines of AI-Generated Code

The developer, known online as u/Ieocoout, shared his journey on Reddit on July 10. He made 188 submissions to AI tools and used Claude to generate roughly 27,000 lines of code. The game's logo, illustrations, textures, and even 3D models were all produced by AI. To keep costs low, he topped up $100 to upgrade his Claude Code plan from 5x to Max 20x, and relied on free trials of GPT images2 and Grok for textures and illustrations.

His role? Writing prompts, planning, testing, and fixing gaps the AI couldn't handle. The biggest challenge came when AI-generated 3D maps turned out poorly. To fix that, he manually built a European-style city using an editor—a task that took several hours to create a playable environment. The multiplayer mode uses a single global city and lobby, with player positions and item stacks transmitted in real-time via WebSocket on Cloudflare.

A New Paradigm Born from AI Programming Competitions

Vibe Jam2026 is an annual "Vibe Coding" game development competition hosted by independent developer Pieter Levels. It draws developers from around the world to create projects using AI tools like Claude Code. This competition highlights the evolution of AI programming from a mere assistant to a standalone development capability.

Key Points

  • AI-only development: The game was built without any manual coding, relying entirely on AI for code, art, and models.
  • Cost-effective: Total investment was minimal, with $100 for Claude Code and free trials for other tools.
  • Human oversight: The developer handled prompts, testing, and manual fixes for AI shortcomings, like building the 3D city.
  • Competition milestone: The win marks a significant achievement for AI-generated projects in a global game jam.